1213961 has 8 divisors (see below), whose sum is σ = 1410624. Its totient is φ = 1023120.

The previous prime is 1213951. The next prime is 1213981. The reversal of 1213961 is 1693121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1213961 - 2⁶ = 1213897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 995 + ... + 1848.

It is an arithmetic number, because the mean of its divisors is an integer number (176328).

2^1213961 is an apocalyptic number.

It is an amenable number.

1213961 is a deficient number, since it is larger than the sum of its proper divisors (196663).

1213961 is an equidigital number, since it uses as much as digits as its factorization.

1213961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2911.

The product of its digits is 324, while the sum is 23.

The square root of 1213961 is about 1101.7989834811. The cubic root of 1213961 is about 106.6763738995.

The spelling of 1213961 in words is "one million, two hundred thirteen thousand, nine hundred sixty-one".